I get this crash when loading with the latest version [1.16.5] SecurityCraft v1.9.jar.
crash-2021-12-20_18.27.37-client.txt

I have... a lot of mods in relation to my modpack: Order of All Creation: Relic hunters when updating securitycraft on it's latest current version this occurs.

Edit: A coder friend says it's a Magnesium conflict? Should I cross report this to magnesium or is it something you can fix?

From what I am aware of, that is correct.

It's something we would need to fix, as Magnesium completely replaces a piece of vanilla code that we want to modify. We'd have to make it compatible with Magnesium. For now, SecurityCraft v1.9 and Magnesium are incompatible, and I'm not sure whether we will fix this at all.

EDIT: As a workaround for now, you can fix it yourself by opening the META-INF/securitycraft.mixins.json file in SecurityCraft's jar file, then removing "camera.WorldRendererMixin",. As a side effect, chunks will stop rendering when starting to view a camera from a long distance while you are moving.

probably not something I can do if I want to have the update in a modpack unfortunately, cause curseforge would probably detect any weirdness? and even if it doesn't, it'll just download the original for everyone else and blow up again.

You're right, that solution is not viable for modpacks. I uploaded an additional jar file that applies the modification I mentioned in my previous comment. https://www.curseforge.com/minecraft/mc-mods/security-craft/files/3574139

Thank you. :D
for clarification, it only causes issues with viewing remote cameras from a longway off while moving?
So like... if you decide to check your cameras while casually riding minecarts sorta moving? and your base is a few hundred blocks in the opposite direction kinda long range?
but if I'm just using stuff like traps, and shielded building materials and other standard security systemy stuff it'll perform just fine?